attrmap - renaming attributes

yosys> help attrmap

attrmap [options] [selection]

This command renames attributes and/or maps key/value pairs to
other key/value pairs.

-tocase <name>

Match attribute names case-insensitively and set it to the specified
name.

-rename <old_name> <new_name>

Rename attributes as specified

-map <old_name>=<old_value> <new_name>=<new_value>

Map key/value pairs as indicated.

-imap <old_name>=<old_value> <new_name>=<new_value>

Like -map, but use case-insensitive match for <old_value> when
it is a string value.

-remove <name>=<value>

Remove attributes matching this pattern.

-modattr

Operate on module attributes instead of attributes on wires and cells.

For example, mapping Xilinx-style "keep" attributes to Yosys-style:

    attrmap -tocase keep -imap keep="true" keep=1 \
            -imap keep="false" keep=0 -remove keep=0